The amount of energy required to break a bond is same as the amount of energy released when the same bond is formed. In gaseous state, the enrgy required for hololytic cleavage of a bond is called Bond Dissociation Energy(BDE) or Bond Strength. BDE is affected by s-character of the bond and the stability of the radicals formed. Shorter bonds typically stronger bonds. BDEs for some bonds are given below:
For the following reaction
`CH_4(g) + Cl_2(g) overset(light)rarr CH_3Cl(g) + HCl(g)`
the correct statement is

Options

A. Initiation step is exothermic with `DeltaH^@ = -58kcal mol^(-1)`
B. Propagation step involving `dotCH_3` formation is exothermic with `DeltaH^@ = -2kcal mol^(-1)`
C. Propagation step involving `CH_3Cl` formation is endothermic with `DeltaH^@ = +27kcal mol^(-1)`
D. The reaction is exothermic with `DeltaH^@= -25kcalmol^(-1)`